Both of these sweet chains have exploded with popularity in such a way that has allowed them to become bicoastal, but they are also staples of their founding cities. New York City has Magnolia Bakery, which offers cakes, pies, and cookies in addition to its signature cupcakes. Los Angeles has Sprinkles Cupcakes, which has added ice cream and dog-friendly cupcakes to its yummy menu. Which bakery can claim to be the best?